Specialist&#39;s chair.



PATENTED FEB. 18, 1908.

THE NORRIS PETERS 2a., WASHINGTON. n. cy

UNITED STATES PATENT OFFICE.

WILLIAM H. KERSEY, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO CLARK & ROBERTS COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

SPECIALIST S CHAIR.

Specification of Letters Patent.

Patented Feb. 18, 1908.

- Applicationfiled March 18. 1907. Serial No. 362.962.

T all whom it may concern:

- Be itknown that I, WILLIAM H. KERSEY,

1 a citizen of the UnitedStates, residing at- Inuseful Improvements in Specialists Chairs,

of which the following is a specification.

T he object of my invention is to produce certain improvements in the construction of a specialists chair by means of which the various parts thereof may be conveniently admjusted to suit requirements.

" Theprincipal objectof-my invention is to produce ahead rest capable of adjustment relative to a chair back, the construction be- 1 ing such that'all of the parts thereof may be held in anydesired position by means of a single clamping member, the construction being such that said clamping member may be operated with one hand, thus leaving the other'hand free for manipulation of the head rest to bring it to the desired position.

In the accompanying drawings, which illustrate my invention, Figure l is a sideelevation in partial vertical section, of a chair embodying my several improvements; Fig. 2 is a sectional detail on line 2 2 of Fig. 1, on a slightly larger scale; Fig. 3, an elevation of the clamping member with the portion of the head rest stem immediately adjacent thereto; Fig. 4 a section on line 4 4 of Fig. 3; Fig. 5 a detail, in partial vertical section, of the head rest and immediately adjacent portions of the composite stem thereof.

In the drawings indicates the base of the chair, which, in the present instance is shown as formed entirely of metal, the pairs of legs 10 and 10 being connected by a suitable brace 11. Pivoted at 12 on the base is a swinging back 13.

The head-rest-bracket is of such form as to be readily attached to any chair-back. Bracket 50 comprises a pair of rearwardly extendingarms 50 which are connected at their outer ends by the portion 50 having a horizontal perforation 51. The vertical faces of the portion 50 should be fairly true and fitting one of said faces is a collar 52 having an axial perforation 52 adapted to aline with perforation 51. Collar 52 is provided at one side, with a radial flange 53 of desired extent. Collar 52 is also provided, in its outer end, with diametrically opposed radial notches 54 adapted to register With a slightly axially-elongated perforation 55 formed through one end of a pin 56 which fits and extends through collar 52and' cross bar 50", and is provided at its opposite end with a threaded portion 56.

Cooperating with the-parts justdescribed is a hook member 57 provided with ahook 57 adapted tostraddle cross-bar 50 and flange 53 of collar 52. The hook member 57 is provided, through its mainbody, with a perforation 58 adapted to receive the -threaded portion 56 of pin 56 but somewhatlarger in diameter than said threaded portion so that when the hook member is canted about its inner corner 57 against onevertical face of cross bar 50, the hook 57 thereof will engage flange 53 and clamp it tightly upon cross bar 50". I Inorder to accomplish this clamping I provide a clamping lever 60 which is threaded upon portion 56 of pin "56. Passing through perforation '55 of pin 56, and adapted to be received in: thenotches 54 of collar 52 is a composite stem composed of a pair of semi-cylindrical stems 61 and 62 which, for the greater portion of: their lower length, are parallel. Secured to the stem 62, near its upper end, is a collar 63 which embraces the stem 61 so as to hold the two stems close together without interfering however with their relative adjustment. The upper ends of the two stems 61 and 62 are laterally separated in the same plane and pivoted to the upper end of stem 61 is a head rest 64 provided with a rearwardly projecting stem 65 which projects through a collar 66 through which the stem may slide longitudinally but which fits the stem snugly.

Collar 66 is pivoted to the upper end of stem 62 upon an axis substantially parallel with the pivotal axis of the head rest 64.

The operation is as follows :When the clamping lever 60 is slightly loosened, pin'56, and collar 52 are free to rotate about the axis of the pin and the composite head-rest stem is free to be reciprocated vertically through the perforation 55. The two stems 61 and 62 are also free to be shifted longitudinally one upon the other, this being accomplished by swinging the head rest 64 about its pivot on stem 61, the finger 65 of the head rest sliding freely through collar 66 while said collar swings upon the stem 62 and causes said stem to shift longitudinally relative to stem 61. The operator may, therefore, by grasping the head rest in one hand, and the clamping lever 60 in the other, swing the head rest upon its horizontal pivotal con- 1 upon one of the stem members, a guide 35 nection with the stem 61; also swing said head rest and the stems upon the horizontal axis of pin 56 as Well as rotate the composite stem 61 and 62 upon its own axis through pin 56 and may also slide the composite stern axially through pin 56, until the desired position of adjustment of the head rest is obtained. Thereupon, by manipulating clamping lever 60, pin 56 may be drawn axially through collar 52 so as to clamp the two stems 61 and 62 tightly in the notches 54 of collar 52 and at the same time cant the hook member 57 on the pin 56 so as to clamp the hook 57 against flange 53 and thus prevent collar 52 and pin 56 irom turning. The hook member 57 mightbe omitted but in such case the clamping action upon the collar 52 to prevent rotation thereof would not be as secure and rigid.

I claim as my invention 1. The combination, with a supporting member, of a pin journaled therein, a collar on said pin adapted to engage the support, a pair of mating stem members passing freely through said pin diametrically and adapted to lie in notches formed in the collar, a hook member through which a threaded end of the pin is passed, said hooked member having a portion adapted to engage the bracket and an opposed portion adapted to engage the collar, a clamping member mounted on the threaded. end of the pin in position to engage the hook member, a head rest pivoted pivoted upon theother of said stem members, and a finger carried by the head rest and projected through the pivoted guide, substantially as and for the purpose set forth.

2. The combination, with a supporting member, of a pin j ournaled therein, a collar on said pin adapted to engage the support, a pair of mating stem members passing freely through said pin diametrically and adapted to lie in notches formed in the collar, a hook member through which a threaded endiof the pin is passed, said hooked member hav ing a portion adapted to engage the bracket and an opposed portion adapted to engage the collar, a clamping member mounted on the threaded end of the pin in position to engage the hook member, a head rest pivoted upon one of the stem members, and a connection between the head rest and the other stem member whereby relative longitudinal movement of the stern members will cause a swinging of the head rest upon its immediate stem member.

In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana, this eleventh day of March, A. D. one thousand nine hundred and seven.

WILLIAM H. KERSEY. 

